I wonder if Al Capone and the whole Chicago crew will be sticking around, or if they were just for the first episode. Same with Lucky Luciano and New York.

This is regarding the end of the episode so don't read if you haven't watched yet.

Who was it that shot the Chicago restaurant guy at the end?

Torrio, who Al Capone is muscle for. [in real life, it was another gangster pal of Torrio's that does the deed].

Why does Torrio kill the guy? Because the guy was against getting into bootlegging, and just wanted to stay in the whoring business (we got that information from Capone, talking to Jimmy outside that one night).

And now that "the Chicago restaurant guy" is dead, Chicago's gang can open up the city to the business of liquor, which, you're probably aware . . . they do. A lot.